I'm 5'11" and my Blake jacket size large goes not quite to mid thigh, like to the bottom of my ass.  I got it at an Orage warehouse sale back in October and they had the Billy jacket, which is reg fit, in an xl and 2xl and they both fit alot smaller.  I don't know how Oakley fits, as I have never tried on one of their jackets, but Orage relaxed fit is big.  It's comparable to the old Masters series Orage that they stopped like 2 or 3 years ago.